I run a tight, but fair ship and I am not afraid to lose an owner of shady tactics. (biggerpockets.com)
But unfortunately, I suspect more competition also means more shady tactics from some providers in the short term. (stemlegal.com)
You can be as aggressive as you want with collecting email addresses, assuming you aren't breaking any laws; but know that quality email lists aren't built on shady tactics. (entrepreneur.com)